Question

我之前没有使用过触发器，所以这是一个“工作”的工作＆＃39;首先刺中我需要达到的目标。一旦我进入价值观＆＃39; V＆＃39;或者＆＃39; AV＆＃39;在VCODE字段中，触发器填充VSYS，SITE_CODE，VAREA＆amp;所需的值。然后将这些值连接到ASSET_TAG字段。

我不认为这是执行此操作的最有效方式，因此有人可以在SQL版本中查看我的杂乱脚本，并建议最有效的方法来实现相同的结果。

由于

Trigger [dbo].[trValve]    
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
Create trigger [dbo].[trValve] on [dbo].[Valve]
after update
as

Begin
set nocount on;
update Valve Set VSYS = 'VLV'
from Valve t  
inner join inserted i on  t.pkID = i.pkID 
and i.VCODE='V' or 
i.VCODE = 'AV'

Begin
set nocount on;
update Valve 
Set SITE_CODE = '00123'
from Valve t  
inner join inserted i on  t.pkID = i.pkID 
and i.VCODE='V' or 
i.VCODE = 'AV'

Begin
set nocount on;
update Valve 
Set VAREA = 'INL'
from Valve t  
inner join inserted i on  t.pkID = i.pkID 
and i.VCODE='V' or 
i.VCODE = 'AV'

Begin
set nocount on;
update VALVE 
SET ASSET_TAG = CONCAT(Valve.SITE_CODE,'-',Valve.VAREA,'-',   valve.VSYS,'-',Cast (pkID As Varchar(50)));


End 
End
End
End
End

Answer 1

您可以通过组合前3个SET语句来缩小一些内容：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TRIGGER [dbo].[trValve] ON [dbo].[Valve]
AFTER UPDATE
AS
BEGIN
    SET NOCOUNT ON;

    UPDATE Valve
    SET VSYS = 'VLV',
    SITE_CODE = '00123',
    VAREA = 'INL'
    FROM Valve t
    INNER JOIN inserted i ON t.pkID = i.pkID
    WHERE i.VCODE = 'V'
    OR i.VCODE = 'AV'

BEGIN
    SET NOCOUNT ON;

    UPDATE VALVE
    SET ASSET_TAG = CONCAT (
            Valve.SITE_CODE,'-',Valve.VAREA,'-',valve.VSYS,'-',Cast(pkID AS VARCHAR(50))
            );
END
END

更新触发后＆amp;级联

1 个答案: